Shifting type head



Jur le 30, 1925; 1,544,146

H. A. FOOTHORAP SHIFTING TYPE HEAD Filed April 30, L925 Patented June 3t), 1925.

UNITED STATES intent arias eerie V HARRY A. FOOTHORAP, O1 HARRISBURG, PENNSYLVANIA, ASSIGNOB '10 ELLIOTT- FISHEB- COML 'ANY, A CQBPORATION 01? DELAVTAEE.

SHIFTING TYPE HEAD.

Application filed April 30, was. Serial no. 635,678.

To aid w lLO-YZZ it may com-0m:

'Be it known that HARRY A. FOOIHORAP, a citizen of the United States, residing at lilarrisburg, in the county of Dauphin and State of Pennsylvania, has invented certain new and useful Improvements in Shifting Type Heads, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to a shifting type head for typewriters of that class in which the change of case is effected by shifting a type head from one position to another on a type bar, the printing movement of which carries the selected type to the work sheet.

The object of the invention is to more type bar, type head and head shifting and retaining means in a group which .will be simple and inexpensive to manufacture and assemble, but whieh will facilitate the accurate positioning of the head in the position to which it is shifted and will insure the retention of the head in such position and against accidental displacement therefrom during the printing or retractile movement of the bar.

in the drawings,

Fig. 1 is a side elevation of a type bar equipped with a type head in accordance with my invention.

, Fig. 2 is a view of the same structure shown at that point in the stroke of the bar at which the tripping of the head takes place.

Fig. 3 is a detail perspective view of the type head group with the parts separated. Fig. 4 is a section of the type head at the axis thereof.

1 indicates a tvne bar mounted at its lower end 2 in the usual or any suitable type ring of a flat platen or other typewriter. The ug end of the bar 1 is disposed at an angle to the bar and has a terminal stop face 3 engaged alternately by stop faces t and 5 of the type head 6. The outer face of the head 6 is equipped with upper and lower case type 7 and 8 alternately presented in the printing position by the shift ing of the head 6. One side of the type head 6 is in the form of a fulcrum plate 9 imposed against the side of the type bar and pivotally secured thereto as by a pintle 10 extended from the plate and having its head located at the opposite side of the type bar and substantially flush with the adjacent side face of the head.

Preferably integral with the fulcrum plate 9 and extended upwardly therefrom in the normal position of the head is a trigger or trip linger 11 in advance of the base of which is a pintle 12 for the pivotal attachment of a double link 13 which straddles the type bar and fulcrum plate and is provided at its lower end with a hook 14 engaging the upper end of a spring 15, the lower end of which is connected to a hook 16 formed at the front edge of the type bar at a point intermediate of its length.

Normally the lower case type 8 is in the printing position, the stop face 4 of the head is in contact vith the stop face 3 of the type bar and the trigger 11 is in the substantially upright position. (See Fig. 1.) In this position a line drawn from the pintle 12 to the hook 16 lies in front of the axis of the type head and the tension of the spring 15 will therefore, be exerted to hold the type head in its normal position. When it is desired to shift from lower to upper case a trip 18 is moved into position to intercept the trigger 11 as the type bar 1 swings toward the platen. This results, as usual, in the swinging of the head 6 on the bar to bring; the upper case type 7 into normal po sition, to present the stop face 5 of the head to the stop face 3 of the bar and to swing the trigger 11 until it can pass under the trip 18. In this shifted position of the head the spring 15 will exert its influence in rear of the axis of the head and will securely retain the head in its shifted position and during the retraction of the bar until the trigger 11 contacts with a buffer ring 19, which, as the bar 1 comes to rest causes the head 6 to be shifted back to its normal or lower case position.

It will be obvious, however, that the spring; 15 will not only hold the type head in either position accordingly as its tension is exerted at one side or the other of the axis of the head, but the final movement of the head in either direction will be accomplished by the spring as soon as its line of tension has passed beyond the center as the head is swung in consequence of the engagement of the trigger 11 by the trip 18 or buffer ring 19.

serve the right to edect such variations of the construction shown'as may come fairly within the scope of the protectionprayed. What'I clann 1s: I

1. The combination with a type bar, of a 7 type head pivotally mounted thereon, a

trigger extended from the head, a'retaining spring for the head, and a positive connection between the spring and head and lnov able to opposite sides of the axis of the head.

2. The combination with a: type bar having a stop face, of a type head pivoted on the bar and having angula-rly related stop faces disposedto alternately. engage the stop face first named, a spring positively connected to the type head above the axis thereof,-and a connection with the type bar below the axis of the head, a trigger extended from the type head, and means c'oacting with the trigger tozshiitt the head and to shift the line of tension of the spring to opposite sides of the axis of thehead. v

3". The combination with a type bar, of a type head pivotally mounted thereon and having a trigger, a double link straddling the type bar and head and pivotally conneeted'to the latter,- and a spring connected I to the lower end of the link and to the type bar the connection between the link and the type head being movable to opposite sides of the axis of the type head.

4E. The combination with a type bar, of a type head pivotally mounted thereon and having a" trigger, a link pivotally connected to the latter, and a spring connected to the lower endofthe linkand to the type bar,

theconnection between the linkandthe type head being movable to opposite sides of the axiso'l the type head. i

In testimony whereof I hereunto affix my signature.

HARRY A. FOOTHORAP. 

